Graduated semielliptic spring



y 5, 3 w. s. ADAM? 1,804,300

GRADUATED SEMIELLIPTIG SPRING Filed March 20, 1930 2 Sheets-Sheet 1 May5, 1931.

w. s. ADAMS GRADUATED SEMI ELLIPTIC SPRING 2 Sheets-Sheet 2 Filed March20, 1930 4 auxiliary springs.

Patented May 5, 1931 UNITED STATES PATENT oFrncE I WALTER S. ADAMS, FPHILADELPHIA, PENNSYLVANIA, ASSIGN'OR TO THE 3. G. BRILL COMPANY, OFFHILADELIHIA, PENNSYLVANIA, A. CORPORATION VANIA 0F PENNSYL- GRADUATEDSEMIELLIP'IIC SPRING Application filed March 20, 1930. Serial No.437,502.

This invention relates to car trucks, and more particularly to the cartrucks of street railway cars.

An important object of the invention is the provision in a car truckconstruction of spring means connecting the bolster and truck frame ofsuch character and so connected with the frame and the axles that agreater bearing of the journal box on the axle is obtained.-

A still further object of the invention is the provision of a structureof this character embodying primary and auxiliary springs at each sideof the truck, these springs being so arranged that the auxiliary springcarries no load during ordinary loading of the car and only comes intoplay when the car is loaded to a point approaching its maximum capacity.

A still further object of the invention is the provisionof a structurepreventing the trou les ordinarily occurring when the normalload-supporting spring breaks.

These and other objects I attain by the con-.

2 struction shown in the accompanying drawings wherein, for the' purposeof illustration, I have shown a preferred embodiment of my invention andwherein:

V Fig. 1 is a fragmentary ,plan view of a truck embodyin my invention;

Fig. 2 is a si e elevation thereof; and

Fig. 3 is a sectional view illustrating the sprin mounting on thebolster.

Re erring'now more particularl to the drawings, the numeral 10 general ydesignates a truck bolster; 11, wheel axles; and 12, the journal boxesthereof. The journal boxes are made wider than in the ordinaryconstruction and are provided with a flat upper surface 13. Adjacenteach side thereof th bolster 10 is provided with ahorizontally-extending flat surface 14 providing a seat for a pair ofinverted semi-elliptic springs 15 and 16 hereinafter referred to as mamand 7 These springs, as in the usual construction, are centrally bandedat 17 and the surface 1* is recessed as at 18 to reeeivethasehands.

A yoke 19isprovided foreaeh bani;

II of springs 15 -16, this yoke being its inner end to the bolster as at.20, extending upwardly and over the spring 16 in spaced relationthereto and is then provided with a downwardly oflset portion 21abutting against the upper surface of the spring 15 to clamp thcsameagainstthe bolster. This end of the yoke is secured by bolts 22, andother bolts 23 preferably connect the yoke adjacent the offset with thebolster, these latter bolts passingbetween springs15 and 16. ends ofsprings15 and 16 seat uponthe journal boxes 12 between'outer faces 13thereofi and are held thereagainst by a superimpose plate 24, bolted tothe journal box by bolts 25 serving. to maintain the proper spacedrelation of the ends of springs 15 and 16 and.

to' hold these sprin s in proper alignment. It will be obvious tli atthe use of the air of springs provides a wider seating sur ace so that agreater bearing of-the journal box upon the axle is provided and thetendency to roper alignment is promoted. When spring 15 has beensufiiciently compressed, the spring 16 will engage against the undersurface of the portion 19 of the yoke and compression of this springwill begin, spring 16 from this point on complementing sprm 15 in itsaction. 7

Since the specific arrangement here1nbefore set forth is obviouslycapable of a considerable range of change and modification without inany spirit of understood as limiting myself thereto except ashereinafter claimed.

I claim:

1. In a car truck, spaced axles and an intermediate bolster, the axleshaving aligned journal boxes providing relatively wide seats upon theirupper sur aces, a pair of leaf springs arranged in side to side relationsecured at their ends to said journal boxes and at their centersoperatively engaging said bolster, one of said springs being rigidlyfixed to said bolster and means carried by the bolster and co-actingwith the other spring to engage and flex the said other spring when thebolster has been depressed to a predetermined extent against the actionof the first-named spring.

The outermanner departing from the my invention, I do not wish to be 7face of one of said springs and a second por- 2. A truck comprisingparallel axles having relatively wide faced journal boxes at oppositeends thereof and a pair of parallel leaf springs disposed at each sideof the truck and having their ends rigidly secured to the said journalboxes.

3. A truck comprising arallel axles having relatively wide faced journalboxes at opposite ends thereof, a pair of parallel leaf springs disposedat each side of the truck and having their ends rigidly secured to thesaid journal boxes, a bolster extending transversely of the truck at theapproximate center thereof, and means on said bolster engaging the uppersurface of one of said sprmgs and vertically-spaced from the uppersurface of the other of said springs.

4. A truck comprising (parallel axles having relatively wide facejournal boxes at opposite ends thereof, a pair of parallel leaf springsdisposed at each side of the truck and having their ends rigidly securedto the said journal boxes, and a bolster extending transversely of thetruck at the approximate center thereof, including a. member having aportion directly engaging the upper surtion vertically oflset withrelation to the first-named portion and extendin over the other of saidsprings in spaced relation thereto. a

5. In a car truck, spaced axles, an inter mediately disposed bolster anda pair of sprin 's connecting the axles adjacent each end thereof andsupported thereby, one of said springs at each side of the trucksupporting the bolsterunder normal loads, the

other of said syirings assisting to support the bolster under anormalloads and supporting the bolster in event of. breakage ofthefirstnamed springs, said springs each comprismg a leaf spring, the srings at each end of :1: axles being spaced ongitudinally of the WALTERs.

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